water pump leak

This is a discussion on water pump leak within the Yamaha YFM660R Raptor (2001-2005) forums, part of the Performance /Technical category; got a leak coming out of the bottom of the water pump out of the small hole at the very bottom. is there supposed to ...

got a leak coming out of the bottom of the water pump out of the small hole at the very bottom. is there supposed to be a hole there? is there a check valve in there or something? i just thought i would ask before i drained all my coolent

That is called the "weep" hole, and it allows any fluid that gets past the seal on the water pump shaft to exit the pump. If you are seeing more than a drop or two, it probably means that the water pump's shaft seal is leaking. Replacement will likely be necessary.

The seal MAY be available alone. It is Yamaha part number 11H-12438-10-00.SEAL, MECHANICAL. Moto-services.net shows it available for about $20, or check with your dealer. You probably should replace the oil seal at the same time, just to make sure that you never leak any coolant into your block. It's - 93101-12173-00, OIL SEAL

It doesn't look like too tough a job, but I haven't done it myself, so can't tell you for sure.

Make sure to check the shaft where the seals rub. If it's rough you need to smooth it up with some VERY fine grit sandpaper or crocus cloth and then clean it thourougly before assembly. Else, the leak will visit you again shortly!

well i just got everything fixed and it was a major pain in the ass. the water seal is a press fit and you have to get that out to change the oil seal. just thought i would let everyone know. and if you are goin to change a seal just change them all it will save you alot of time